[ENH] Add _graph_checksums to input_spec if missing

[NicolasGensollen]

Types of changes

• New feature (non-breaking change which adds functionality)

Summary

Following #573, this PR proposes to automatically add _graph_checksums to the input_spec provided to the workflow when these specifications are provided directly as a SpecInfo instance.
This is already done automatically when input_spec is provided as a list of strings.
This PR also proposes to put the input sanitization code in a separate helper function.

Checklist

• I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Base: 77.13% // Head: 76.76% // Decreases project coverage by -0.36% ⚠️

Coverage data is based on head (a7374aa) compared to base (67f7e72).
Patch coverage: 91.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #584      +/-   ##
==========================================
- Coverage   77.13%   76.76%   -0.37%     
==========================================
  Files          20       19       -1     
  Lines        4330     4313      -17     
  Branches     1217     1215       -2     
==========================================
- Hits         3340     3311      -29     
- Misses        802      813      +11     
- Partials      188      189       +1     

Flag	Coverage Δ
unittests	76.69% <91.66%> (-0.35%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pydra/engine/core.py	89.28% <91.66%> (+0.20%)	⬆️
pydra/utils/profiler.py	38.16% <0.00%> (-5.35%)	⬇️
pydra/engine/helpers.py	78.72% <0.00%> (-1.19%)	⬇️
pydra/engine/task.py	86.15% <0.00%> (-0.62%)	⬇️
pydra/__init__.py

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.